package com.hdl.widget.CoverFlowViewPager;
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import android.support.v4.view.ViewPager;
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import android.view.View;
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/**
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* Created by JLChen on 2019/8/26
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*/
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public class CoverTransformer implements ViewPager.PageTransformer {
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public static final String TAG = "CoverTransformer";
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public static final float SCALE_MIN = 0.3f;
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public static final float SCALE_MAX = 1f;
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public static final float MARGIN_MIN = 0f;
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public static final float MARGIN_MAX = 50f;
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public float scale = 0f;
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private float pagerMargin = 0f;
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private float spaceValue = 0f;
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private float rotationX = 0f;
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private float rotationY = 0f;
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public CoverTransformer(float scale, float pagerMargin, float spaceValue, float rotationY) {
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this.scale = scale;
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this.pagerMargin = pagerMargin;
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this.spaceValue = spaceValue;
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this.rotationY = rotationY;
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}
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@Override
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public void transformPage(View page, float position) {
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// Log.d(TAG,"position:"+position);
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if(rotationY != 0){
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float realRotationY = Math.min(rotationY,Math.abs(position * rotationY));
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page.setRotationY(position < 0f ? realRotationY : - realRotationY);
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}
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if (scale != 0f) {
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float realScale = getFloat(1 - Math.abs(position * scale), SCALE_MIN, SCALE_MAX);
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page.setScaleX(realScale);
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page.setScaleY(realScale);
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}
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if (pagerMargin != 0) {
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float realPagerMargin = position * (pagerMargin);
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if (spaceValue != 0) {
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float realSpaceValue = getFloat(Math.abs(position * spaceValue),MARGIN_MIN,MARGIN_MAX);
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realPagerMargin += (position > 0) ? realSpaceValue : - realSpaceValue;
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}
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page.setTranslationX(realPagerMargin);
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}
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}
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private static float getFloat(float value,float minValue,float maxValue){
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return Math.min(maxValue, Math.max(minValue, value));
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}
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}
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